Well that depends on how you define evolution unfortunately. Small scale evolution is fact, but before you jump on me with that Pious stick... *wields his Heresy Shield*
Anyway evolution on a small scale makes sense. Lets take something I learned about Cheetahs recently. The young kittens/pups/whatever have a large tuft of fur on the back of their neck. This is there to make them appear larger and more formidable to predators.
Now prior to this "evolving" lets suppose there were two cheetah babies. One had slightly longer hair on the back of its neck than the other. This happens thanks to just the seemingly random way DNA gets paired up, the same reason two children of the same parents dont look identical. When a predator decide he felt like some Cheetah for supper he saw two easy targets. He decided to go after the one that looked like an easier catch: the one without the fur on the back of its neck. So now we have one cheetah left. This guy grows up and has kids of his own. Because they got some genes from their father one has rather long fur on his neck (even moreso than his dad). Some predator gets the munchies, and the cycle continues.
Now this is relatively simple and if you have any problems with it I am stumped since I am pretty narrow-minded.
As for large scale evolution, there is plenty of evidence that people can say points one way or another, but, obviously, none of it is terribly convincing since people seem to be quite divided over this.
If you want to see "evidence" pointing one way or another, look it up on Google if you are truely open to other possibilities.